Telephonic repeater.



No. 817,761@ PATENTED APR.17, 1 906- M. GALLY.

TELEPHONIG REPEATER.

APPLICATION FILED APR. 14, 1904'.

MERRiTT GALLY, OF BROOKLYN, NEW YORK.

TELEFl' -EUNEC REPEQTER.

sir/sci.

fipecification of Letters Patent.

.Eatentecl April 17, 1906.

Application filed April 14, 1904. Serial No. 203,165.

To (all whom it may concern.-

Be it known that I, Mirnnrr'r GALLY, a citizen of the United States, residing at Brooklye, in the county of Kings and State of New York, have invented certain new and useful Improvements in Telephonic Repeaters, of WllICll the following is a specification.

In endeavorin to repeat telephonic mes sages from one telcphonedine to another telephone-line it hasbeen customary to use two receiving-magnets, two diaphragms, and two retransmitting devicesone of each for each -ct the two lines. In my Patents Nos. 749,481,

751,845, and 753,257 I use only one diaphragm operated u on by a compound receiving-ma net (1011. ly wound, the two wires of the win ing to connect one with one of the tele hone-lines and the other with the other to ephone-line. L1 my present invention I use only one retransmittmg device and havin only one diaphragm, but operate magnetica ly upon this one diaphragm D with two separate receiving-m mots M M, one distinct magnet for each of t e two telephone-lines L L and I? L. A c'up n of carbon-granules with button-electrode and the coacting diaphragm D constitute the one retransmitting device common to both lines. Each main line L L and L- Uhas its own receiving-mag net M M,-respectivel and its own transmitting induotion-coil 1 respectively. Two batteries B and B and two corresponding primary circuits (2 and d are shown. I reer to use two rima circuits for the fol owing reasons: irst, w on the main lines difi'er much in length two distinct batteries are much better than one, as they can then be adapted each to the requirements of its own main line, and, secondly, this aids in adapt-- ing the several parts of each side of the mstrument to its particular part of the work of' this double re eater.

When the in notion-coils I I are used with separate batteries, the unison of the two sides of the double repeater is secured by the single diaphragm and single retransmitting device acting for both primary circuits simultaneously. I uselindependent inductive means, as C C, separate from the receiving-magnets and k the induction-coils of the primary circuits and having two wires inductively related one to the other, one wire primary to the other, and vice versa, both ends of one of the wires connecting with the line L L and both ends of the other wire connecting with the line L L, this ind uction means C C serving to pass a portion of the ori inul message from line to line and aiding in olding the two lines in unity of action, although the single diaphragm actuated by both lines may be used without coil C C, as said single diaphragm serves to preserve unity as heretofore stated. To further hold the two lines L L and L L in harmony of action, I find it advantageous to connect the two lines for a li ht constant current, the connections N N i 3 N 2 of lines L L L L respectiyely, havin in them resistances, as R R R R making them of high enough resistance to always shunt suficient current through both sides of the re cater to secure its full repeating action. hese resistances I preferably make of graphite and clay mixed. These resista'nces are much better than resistancecoils, as the are not disturbed by induction.

I find undier some conditions that it is well to have a constant electric current passing through the line while in'use this current being independent of pulsations. This is especially esirable to provide for the leakages on theline and to minimize the effects of noises and disturbing indications on the passing message. For this purpose I :1 ply electric energy between the resistances R and R R to the wires connectin one of the main lines to the other main line. atteries B and B are shown for this purpose.

In the drawings, P P" represent the two independent premanent magnets for independent' connection separately each with its own main line. are turned at right angles at t eir ends to both project toward the single diaphragm D as near as ossible to its center.

he primary circuit (1 leads from battery B to the'retransmittern D and through the induction-coil I. The primary circuit d leads from batte B to the retransmitter n D and through in notion-coil I.

The circuits and operation of the repeating devices are as follows: The main-line wire L enters through binder :c and continues to and through me. net M, and on leaving said magnet passes own to and through the outer windin of induction-coil I, then out at left thereof, own to and entering independent induction-coil C C, and continuing through one Winding thereof and emerging at bottom ofleft of said coil and passingup to binder a: and so to main line-wire 1/1 The upper the telephonic electric Their electroma net pole-pieces v wire oi hotter ii enters through a hunter and continues upward hy J until it enters the conductive metallic nrni i which holds in 5 is condnetwely connected with the r nary are the exact counterpart in the'right hiill oi the nppnrntus to the (ll' 't1)l$]tt5i, de-

scrihaai or main line lJ l/ and hattery pril ner oi the toll hall".

in operation a telephonic impulse on main line L l/ energizes nuignet ll, therehy moving diaphragm l) nnd ehungine; the conductivity of the granules in cup It and vary in; the prinniry current. of battery l3 and circuit (l thus rousing ii reenergized repeticn to main line L" j by the induction torn prinnu y circuit u'" or coil .1 to its secondorg; winding, which secondary winding is a port oi circuit oi main line if L. The some original in pnlse on main line L L and its nction on magnet Bi and retrznlsmittero1 l.) cause it variation in primary circuit (1 similar to the Variation in primary circuit 41 the said variation of d causing it reenergized repetition ol the original impulse or" L L on itsell, end this reenergized repealed inuiulse, together with the ori rinnl impulse, induces over to main line L" if through inductioncoil (1 L, thus ridding to the repeated im pulse caused by n 1) through prinnu'y circuit d and induction-coil i. This backward repeating to the main line, .which started original impulse, causes a repeated uphuilding in rotation oi action as just described, constituting a most in'iportnnt means to the results attained its the rapidity of electric Wares and tmvel is so infinitely great compared to vthe rn'iidity of acoustic vibrations, the shove-deserihed uphuilding rotation oi telephonic impulse cannot confuse. or distort the acoustic trans mission, but does build up and :implily each and every acoustic ware.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. in n telephone-re )eater for repeating telephonic pulsations from one telephonoline to another telephone-line; 3 single. rcceiving-diuphrugm; and two independent receivingqncgnets, both nnign'ets on one side of said diaphragm and to operate said single (liaphrw m, one of the magnets for connec tion with one telephonedine, and the other magnet for connection with the other tcle phone-line.

2, In a telelphone-repeeter for repeating telephonic pu stations from one telcphoncline to sn'iother telephone-line: a single (1' clung-n2; and two independent magnets n. one side of said diaphragm and for operating said sin diaphragm energizingycoils :l'or til magnets; the cnergizingwoil oi'one of t magnets for connection With one i the phone-lines and the energizing-ooil of tilt: other nmgnet for connection with the other teleplmne line.

3. in o telephonic repeater; a so phlegm; two independent i'llitglflt one telcphone-line nnd the other to telephone-line; a rotrsnsmitting (it i two retinnsinitting induction-coils, one i. duction-ccil for each of the two teiephi; lines.

l. in a telephone-reneater for repeot' telephonic pulsations irorn one tie ophoiiiclin to another telephone-line; means i r vine the pulsations for both of the phone-lines; retinnsinitting niezins .tor posting the telephone pulsatio the telephone-lines to the e ier telcn line; and an independent i duction ing two wires estnhlishiiu iductivc bet een the two telepho wires oi the coil to connect with. one o telephone-lines and the other Wire to ca with the other telephone-line.

5. in combination with a, repeating for repeating telephonic pulsations telephone-line to another tclephc connection between the two tclephoin. for passing a constant current iroi the other; the resistance being grew to shunt sufiicient current through posterior its operation.

6. in :1 repeating device for repent. phonic pulsations from one telephone another telephone-line; a (lisp; l independent receiving-mo. nets, h nets to operate the some nisplnn m; duction-coil of two Wires, one \ViKL with one of the teleohone-lines, a. wire to connect with the other line.

'7. In o repeating device for rep phonic impulses from one telep another telephone-line; s diziph independent receiving mngne nets to operate the some dis duction-coil consisting of a core coiled. wires, one of the wires as p the other wire and vice verse, one connect with one of the tele )hone-l' the other Wire to connect with the otner phone-line.

8. In combination with a repeat d for repeating-telephonic impulses iroin one telephone-line to another telephone-l ne connection between the two telephoi and an electric generator for passing i pendent electric current through. the two nectcd lines, and from one to the other:

9. In combination with a repeating device for re eating telephonic'impulseefmm one telephone line v to: {another telephone line connection 1; etween the two telephone-lines .and in 'said cr'nmnection an electnc generator 5 for passing'an independent current from one line to the other and through the lines; and resistance in the connection great enough to .shunt sufiicient of the pulsating current through the repeater for its repeatlng operation.

MERRITT GALLY. Witnesses: I

JOSEPH G. SIMPSON, G. POTTER. 

